/*
 * Copyright 2024 The CHANGLEI Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'dart:async';

/// Created by changlei on 2023/5/10.
///
/// 异步操作
class AsyncTask {
  Completer<bool>? _completer;

  /// 执行操作
  Future<bool> execute(FutureOr<void> Function() computation) {
    cancel();
    final completer = Completer<bool>.sync();
    _completer = completer;
    Future.sync(computation).whenComplete(() {
      if (!completer.isCompleted) {
        _completer = null;
        completer.complete(true);
      }
    });
    return completer.future;
  }

  /// 取消
  void cancel() {
    final completer = _completer;
    _completer = null;
    completer?.complete(false);
  }
}
